Food Webs and Cycles Unit Test
2 of 92 of 9 Items
Question
Which of the following describes the different classifications of consumers in an ecosystem?(1 point)
Responses
Herbivores are always plants. Carnivores are always animals. Omnivores are always humans.
Herbivores are always plants. Carnivores are always animals. Omnivores are always humans.
Herbivores only live in aquatic ecosystems. Carnivores and omnivores only live in terrestrial ecosystems.
Herbivores only live in aquatic ecosystems. Carnivores and omnivores only live in terrestrial ecosystems.
Herbivores eat producers. Carnivores eat other consumers. Omnivores eat producers and other consumers.
Herbivores eat producers. Carnivores eat other consumers. Omnivores eat producers and other consumers.
Herbivores are tertiary consumers. Carnivores are primary consumers. Omnivores are also primary consumers.
Which of the following is a true statement?(1 point)
Responses
All organisms generate waste and dead material that is recycled by decomposers.
All organisms generate waste and dead material that is recycled by decomposers.
All organisms rely on photosynthesis, which is done by decomposers.
All organisms rely on photosynthesis, which is done by decomposers.
All organisms are considered decomposers in aquatic ecosystems since all organisms are underwater.
All organisms are considered decomposers in aquatic ecosystems since all organisms are underwater.
All organisms in an ecosystem eat decomposers to survive.
All organisms in an ecosystem eat decomposers to survive.
All organisms generate waste and dead material that is recycled by decomposers.
Describe the difference between a food chain and a food web.(1 point)
Responses
A food chain contains herbivores only. A food web contains herbivores, carnivores, and omnivores.
A food chain contains herbivores only. A food web contains herbivores, carnivores, and omnivores.
A food chain represents one possible pathway that energy and matter can take in an ecosystem. A food web contains multiple, interconnected food chains.
A food chain represents one possible pathway that energy and matter can take in an ecosystem. A food web contains multiple, interconnected food chains.
A food chain represents at least two pathways of matter transfer from primary consumer to secondary consumer. A food web contains only one pathway and only includes producers.
A food chain represents at least two pathways of matter transfer from primary consumer to secondary consumer. A food web contains only one pathway and only includes producers.
A food chain does not contain decomposers. A food web contains at least one decomposer.
A food chain represents one possible pathway that energy and matter can take in an ecosystem. A food web contains multiple, interconnected food chains.
Why is the water cycle important for ecosystems?(1 point)
Responses
The water cycle permanently removes water from underground and from large bodies of water and transports it to terrestrial ecosystems.
The water cycle permanently removes water from underground and from large bodies of water and transports it to terrestrial ecosystems.
The water cycle helps recycle and transport water around the planet. The cycle replenishes the water supply of ecosystems.
The water cycle helps recycle and transport water around the planet. The cycle replenishes the water supply of ecosystems.
The water cycle uses photosynthesis to make clouds. These clouds make surface water that animals drink to survive in their ecosystem.
The water cycle uses photosynthesis to make clouds. These clouds make surface water that animals drink to survive in their ecosystem.
The water cycle helps plants keep and store water. The cycle makes sure that water stays at Earth's surface and is available to ecosystems.
The water cycle helps recycle and transport water around the planet. The cycle replenishes the water supply of ecosystems.
Which is an example of the carbon cycle occurring slowly?(1 point)
Responses
The movement of carbon dissolved in ocean water into rocks.
The movement of carbon dissolved in ocean water into rocks.
The movement of carbon dioxide exhaled by humans to a plant.
The movement of carbon dioxide exhaled by humans to a plant.
The movement of carbon from prey to predator.
The movement of carbon from prey to predator.
The movement of carbon dioxide into the atmosphere when bacteria decomposes dead matter.
The movement of carbon dioxide into the atmosphere when bacteria decomposes dead matter.
The movement of carbon dissolved in ocean water into rocks.
Which of the following best describes the nitrogen fixation process?(1 point)
Responses
Producers use the energy from sunlight to fix nitrogen gas in the atmosphere. Producers can then absorb nitrogen through their leaves.
Producers use the energy from sunlight to fix nitrogen gas in the atmosphere. Producers can then absorb nitrogen through their leaves.
Soil bacteria convert nitrogen gas into ammonia, nitrites, and then nitrates. Nitrates are then absorbed by producers.
Soil bacteria convert nitrogen gas into ammonia, nitrites, and then nitrates. Nitrates are then absorbed by producers.
Producers convert nitrogen gas into nitrates in the soil. Producers can then absorb nitrates through their roots.
Producers convert nitrogen gas into nitrates in the soil. Producers can then absorb nitrates through their roots.
Consumers convert nitrogen gas into ammonia, nitrites, and then nitrates. Waste from consumers adds nitrogen to the soil, which can be used by producers.
Consumers convert nitrogen gas into ammonia, nitrites, and then nitrates. Waste from consumers adds nitrogen to the soil, which can be used by producers.